WO2006080781A1 - Adhesive sheet having multi-staged air vent channels - Google Patents
Adhesive sheet having multi-staged air vent channels Download PDFInfo
- Publication number
- WO2006080781A1 WO2006080781A1 PCT/KR2006/000106 KR2006000106W WO2006080781A1 WO 2006080781 A1 WO2006080781 A1 WO 2006080781A1 KR 2006000106 W KR2006000106 W KR 2006000106W WO 2006080781 A1 WO2006080781 A1 WO 2006080781A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channels
- stage
- adhesive
- air vent
- sheet
- Prior art date
Links
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 95
- 239000000853 adhesive Substances 0.000 title claims abstract description 94
- 239000012790 adhesive layer Substances 0.000 claims description 14
- 238000012546 transfer Methods 0.000 claims description 4
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 23
- 238000004049 embossing Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24562—Interlaminar spaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- the present invention relates to an adhesive sheet for fixing a film to a target surface using an adhesive.
- An adhesive sheet is applied to a variety of fields due to its easiness of use by which a film can be detachably attached to a target surface.
- Specific examples of the adhesive sheet include a reflective sheet, an advertisement film, a finishing film for construction, a label, a tape, and the like.
- a base sheet is first prepared by means of rolling or casting, an adhesive is coated on one surface of a release liner, and the coated surface of the release liner and one side of the base sheet are put together with each other.
- the release liner is generally configured by coating paper with polyethylene, polypropylene, polyester or the like, and the coating is treated with silicone or otherwise to facilitate easy separation from the adhesive.
- a release surface of the release liner is prepared to have good smoothness so that the adhesive can be coated to have a uniform thickness.
- a film having a smooth adhesive surface may cause inferior appearance due to a swelled surface of the film since air may be trapped between an adhesive and a target surface while the film is attached to the target surface.
- an adhesion area to the target surface is reduced due to a layer of the trapped air, resulting in decrease of an adhesive force.
- a discrete adhesive layer is formed on a sheet, an adhesive-free portion of the sheet can serve as a channel through which air may be removed.
- a discrete adhesive layer is formed by arranging an adhesive in the form of islands on a film through printing or spraying, and drying the adhesive islands.
- a texture on a silicon-treated surface of a release liner or film is modified so that the texture can be transferred to the surface of an adhesive layer, thereby forming channels for use in removing air.
- European Laid-Open Patent Publication No. 279579 discloses a pressure sensitive adhesive sheet including a successive adhesive layer with an irregular adhesive surface. This successive adhesive layer with the irregular adhesive surface enables provision of both initial ability and lasting ability to relocate the sheet on a variety of target surfaces during construction.
- Japanese Laid-Open Patent Publication No. 6-212131 discloses improvement of both easiness of removal of air and ability to relocate a sheet by imparting convexo- concave portions on the surface of a successive adhesive layer.
- the invention disclosed in the publication provides a re-peelable adhesive sheet for decoration, wherein each of the convexo-concave portions has a height of 10 to 20mm, a bottom width of 50 to 100mm, and a width of its upper flat surface of 50 to 100mm.
- U.S. Patent No. 5650215 discloses a method for producing a product such as an adhesive tape or a transfer coat, which includes a successive pressure sensitive adhesive layer with a micro texture having a series of patterns of which the aspect ratio is about 0.1 to about 10.
- the micro texture should have microscopic dimensions in at least two of height, width and length, and the product such as an adhesive tape or a transfer coat with the micro texture can obtain initial ability to relocate the product.
- U.S. Patent No. 6524675 limits the volume of air removal channels formed by a micro texture to at least 1 10 3 mm 3 per circular area of an adhesive with a diameter of 500mm. Moreover, in order to meet the above condition, a pitch of patterns is limited to 400mm or less so that a convexo-concave configuration does not appear on a front surface of a sheet attached to a target surface.
- U.S. Patent No. 6630218 discloses two processes of coating an adhesive on a flat release liner and putting the release liner together with a sheet so that a flat configuration is memorized in the adhesive; and removing the release liner and putting the sheet together with a release liner having a convexo-concave texture so as to give a convexo-concave texture to the surface of the adhesive.
- the adhesive is restored to its flat configuration memorized therein due to elasticity of the cross-linked adhesive, whereby the convexo-concave texture disappears.
- at least 92% of an adhesion area is obtained after 48 hours at 25 0 C so that the convexo-concave patterns existing in the adhesive cannot emerge on the surface of the sheet.
- U.S. Patent No. 6197397 discloses formation of a micro-replicated adhesive surface having both micro-channels for fluid discharge and pegs for improved adhesive property. Such micro-embossed patterns have the micro-channels for fluid discharge and depressions in which a non-adhesive material may be placed, thereby facilitating removal of air and simultaneously improving ability to relocate a sheet. [16]
- the present invention is to remove air trapped upon application of an adhesive sheet, to improve re-peelabilty and ability to relocate a sheet, and to improve an appearance and adhesive force after application thereof.
- the present invention is intended to solve the aforementioned problems by connecting two types of channels: a first type of channels that can be easily vanished by pressure during application of a sheet, and a second type of channels that cannot be vanished for a certain period of time after application of the sheet.
- the present invention provides an adhesive sheet in which channels with different depths are formed upon formation of convexo-concave portions in the surface of an adhesive to define air vent channels, so that some channels can be vanished under low pressure to increase an adhesion area and thus a designed level of adhesive force of the adhesive can be achieved within a short period of time, and a method for manufacturing the adhesive sheet.
- the convexo-concave surface enables discharge of air trapped between an adhesive surface and a target surface during application of the sheet, and the channels are vanished within a short period of time to increase the smoothness of the adhesive surface, thereby preventing the convexo- concave portions of the adhesive from emerging on the surface of the sheet.
- a reverse texture corresponding to air vent channels is embossed in a release liner using a general embossing method.
- the release liner is made by coating paper with a thermoplastic resin such as polyethylene or polypropylene, so that it can be easily deformed by heat or pressure.
- An embossing roll is heated to about a melting point of the resin coated on the release liner and imparts patterns to the release liner that passes through a nip portion between the embossing roll and a rubber roll.
- the temperature of the embossing roll is preferably 90 to 16O 0 C. If the temperature of the embossing roll is too low, desired patterns cannot be embossed due to lack of fluidity of the thermoplastic resin. On the contrary, if the temperature of the embossing roll is too high, the resin is excessively melted, so that desired patterns cannot be embossed.
- the channels on the adhesive surface formed by embossing the release liner have different heights and widths and are connected with one another, so that air trapped upon application of the sheet can be discharged outside the sheet.
- the air vent channels include low channels (L)
- the low channels (L) 11 should be connected to the high channels (H) 12. Since the channels (H) 12 have a height larger than that of the low channels (L) 11, the high channels are not easily vanished and thus can discharge air collected through the low channels (L) 11 outside the sheet.
- the low channels (L) 11 that are first vanished are called first-stage channels
- the high channels (H) 12 are called second-stage channels.
- the first-stage channels have a height of at least
- first-stage channels are excessively shortened to have a pattern pitch of 2mm or less, a contact area with a target surface is reduced to decrease an initial adhesive force, which may cause separation immediately when the sheet is attached to a curved portion.
- patterns configured by the first- stage and second-stage channels have a pitch of at least 2mm.
- each of the first-stage channels (L) preferably has a width of 10 to 30mm and each of the second-stage channels (H) preferably has a width of 30 to 60mm.
- the first-stage channels (L) are expected to obtain air discharge effects for a short period of time but have a degraded function of discharging air outside edges of the sheet.
- the first-stage channels are preferably formed to be connected to the second-stage channels (H) such that they have lengths of less than 4mm. That is, the second-stage channels preferably have a pattern pitch of less than 4mm.
- Each of the channels may have a cross section with a geometric figure such as a rectangle, a triangle, a pentagon and a U-shape, and the first-stage channels may have sectional shapes different from those of the second-stage channels.
- the sectional shape of a channel is not a rectangle, its behavior is determined according to a bottom width and a largest height of the channel except a case where the sectional shape is exceptional.
- width refers to a bottom width of a channel
- height refers to a largest height of a channel.
- Such patterns are formed on the surface of an adhesive by means of transfer.
- a liquid adhesive is coated and dried on the surface of a release liner having embossed patterns.
- the adhesive preferably has a thickness of 20 to 50mm after it has been dried.
- a base sheet is attached thereto by means of rolling or casting, thereby producing a finished product.
- first-stage channels having a smaller height and second-stage channels having a larger height are formed to be connected to one another, so that the first-stage channels can serve as air vent channels with a shorter length for a short period of time and then be vanished to give a wider contact area, while the second-stage channels can serve as air vent channels for a long period of time, resulting in improvement of application of an adhesive sheet, and prevention of emergence of patterns on a front surface of the sheet from the channels to improve an appearance.
- Fig. 1 is a sectional view showing air vent channels of an adhesive layer according to the present invention
- Fig. 2 shows an adhesive surface of the adhesive layer having the air vent channels according to the present invention
- Fig. 3 shows an adhesive surface of an adhesive layer having air vent channels according to another embodiment of the present invention.
- An adhesive sheet was prepared in the substantially same manner as the example, except that a release liner in which an air removal channel is not formed on a release surface thereof. As seen from Table 2 below, an adhesive force was highest but an appearance after the attachment was worst due to trapped air.
- Comparative Example 3 except that a pattern pitch was increased as shown in Table 2. An adhesive force was good, but air removal was extremely deteriorated.
- Comparative Example 4 In this comparative example, one kind of channels was formed as shown in Table 2. The width of the channels was increased, and an adhesive sheet was formed in the same manner as the example. An adhesive force was remarkably deteriorated, and a film surface state was poor.
- Comparative Example 4-1 [71] In this comparative example, an adhesive sheet was formed in the same manner as Comparative Example 4 except that the height of the channels was increased as shown in Table 2. An adhesive force was remarkably deteriorated, and a film surface state was extremely poor.
- Comparative Example 5 [74] In this comparative example, low channels (L) and high channels (H) were formed as shown in Table 2. The channels had a relatively larger width over the example. Deterioration of an adhesive force was found due to decrease in an initial adhesion area, and a surface film state was found to be slightly poor.
- the height of the channels is preferably not greater than 20mm.
- first-stage channels having a smaller height and second-stage channels having a larger height are formed to be connected to one another, so that the first-stage channels can serve as air vent channels with a shorter length for a short period of time and then be vanished to give a wider contact area, while the second-stage channels can serve as air vent channels for a long period of time, resulting in improvement of application of an adhesive sheet, and prevention of emergence of patterns on a front surface of the sheet from the channels to improve an appearance.
Abstract
The present invention is to improve application of an adhesive sheet by imparting air vent channels to an adhesive surface of the sheet. According to the present invention, air vent channels are formed to have various heights and widths so that the respective air vent channels can be vanished at certain time intervals, thereby facilitating removal of air and increasing an adhesion area to shorten time required for obtaining a designed adhesive force, and the increase of the adhesion area improves smoothness between an adhesive surface and a target surface so that patterns of the air vent channels cannot emerge on a front surface of the sheet.
Description
Description
ADHESIVE SHEET HAVING MULTI-STAGED AIR VENT
CHANNELS
Technical Field
[1] The present invention relates to an adhesive sheet for fixing a film to a target surface using an adhesive.
[2]
Background Art
[3] An adhesive sheet is applied to a variety of fields due to its easiness of use by which a film can be detachably attached to a target surface. Specific examples of the adhesive sheet include a reflective sheet, an advertisement film, a finishing film for construction, a label, a tape, and the like.
[4] To produce such an adhesive sheet, a base sheet is first prepared by means of rolling or casting, an adhesive is coated on one surface of a release liner, and the coated surface of the release liner and one side of the base sheet are put together with each other.
[5] The release liner is generally configured by coating paper with polyethylene, polypropylene, polyester or the like, and the coating is treated with silicone or otherwise to facilitate easy separation from the adhesive.
[6] A release surface of the release liner is prepared to have good smoothness so that the adhesive can be coated to have a uniform thickness. A film having a smooth adhesive surface may cause inferior appearance due to a swelled surface of the film since air may be trapped between an adhesive and a target surface while the film is attached to the target surface. In addition, an adhesion area to the target surface is reduced due to a layer of the trapped air, resulting in decrease of an adhesive force.
[7] In order to solve this problem, there has been made an attempt in which a non adhesive inorganic material, metallic component or glass is positioned on the surface of a successive adhesive layer to enable adjustment of the position of a sheet, to impart easiness of removal of air and to provide the surface of the adhesive layer with passages through which air can be discharged.
[8] If a discrete adhesive layer is formed on a sheet, an adhesive-free portion of the sheet can serve as a channel through which air may be removed. Such a discrete adhesive layer is formed by arranging an adhesive in the form of islands on a film through printing or spraying, and drying the adhesive islands.
[9] Alternatively, a texture on a silicon-treated surface of a release liner or film is modified so that the texture can be transferred to the surface of an adhesive layer,
thereby forming channels for use in removing air.
[10] European Laid-Open Patent Publication No. 279579 discloses a pressure sensitive adhesive sheet including a successive adhesive layer with an irregular adhesive surface. This successive adhesive layer with the irregular adhesive surface enables provision of both initial ability and lasting ability to relocate the sheet on a variety of target surfaces during construction.
[11] Japanese Laid-Open Patent Publication No. 6-212131 discloses improvement of both easiness of removal of air and ability to relocate a sheet by imparting convexo- concave portions on the surface of a successive adhesive layer. In particular, the invention disclosed in the publication provides a re-peelable adhesive sheet for decoration, wherein each of the convexo-concave portions has a height of 10 to 20mm, a bottom width of 50 to 100mm, and a width of its upper flat surface of 50 to 100mm.
[12] U.S. Patent No. 5650215 discloses a method for producing a product such as an adhesive tape or a transfer coat, which includes a successive pressure sensitive adhesive layer with a micro texture having a series of patterns of which the aspect ratio is about 0.1 to about 10. The micro texture should have microscopic dimensions in at least two of height, width and length, and the product such as an adhesive tape or a transfer coat with the micro texture can obtain initial ability to relocate the product.
[13] In addition, U.S. Patent No. 6524675 limits the volume of air removal channels formed by a micro texture to at least 1 103mm3 per circular area of an adhesive with a diameter of 500mm. Moreover, in order to meet the above condition, a pitch of patterns is limited to 400mm or less so that a convexo-concave configuration does not appear on a front surface of a sheet attached to a target surface.
[14] U.S. Patent No. 6630218 discloses two processes of coating an adhesive on a flat release liner and putting the release liner together with a sheet so that a flat configuration is memorized in the adhesive; and removing the release liner and putting the sheet together with a release liner having a convexo-concave texture so as to give a convexo-concave texture to the surface of the adhesive. When the release liner is removed, the adhesive is restored to its flat configuration memorized therein due to elasticity of the cross-linked adhesive, whereby the convexo-concave texture disappears. Further, at least 92% of an adhesion area is obtained after 48 hours at 250C so that the convexo-concave patterns existing in the adhesive cannot emerge on the surface of the sheet.
[15] U.S. Patent No. 6197397 discloses formation of a micro-replicated adhesive surface having both micro-channels for fluid discharge and pegs for improved adhesive property. Such micro-embossed patterns have the micro-channels for fluid discharge and depressions in which a non-adhesive material may be placed, thereby facilitating removal of air and simultaneously improving ability to relocate a sheet.
[16]
Disclosure of Invention Technical Problem
[17] The present invention is to remove air trapped upon application of an adhesive sheet, to improve re-peelabilty and ability to relocate a sheet, and to improve an appearance and adhesive force after application thereof.
[18] The present invention is intended to solve the aforementioned problems by connecting two types of channels: a first type of channels that can be easily vanished by pressure during application of a sheet, and a second type of channels that cannot be vanished for a certain period of time after application of the sheet.
[19] It is an object of the present invention to provide an adhesive sheet, wherein air vent channels are formed to have various heights and widths so that the respective air vent channels can be vanished at certain time intervals, thereby facilitating removal of air and rapidly increasing an adhesion area to shorten time required for obtaining a designed adhesive force, and an adhesion area is increased to improve smoothness between an adhesive surface and a target surface so that patterns of the air vent channels cannot emerge on a front surface of the sheet.
[20]
Technical Solution
[21] The present invention provides an adhesive sheet in which channels with different depths are formed upon formation of convexo-concave portions in the surface of an adhesive to define air vent channels, so that some channels can be vanished under low pressure to increase an adhesion area and thus a designed level of adhesive force of the adhesive can be achieved within a short period of time, and a method for manufacturing the adhesive sheet. In addition, the convexo-concave surface enables discharge of air trapped between an adhesive surface and a target surface during application of the sheet, and the channels are vanished within a short period of time to increase the smoothness of the adhesive surface, thereby preventing the convexo- concave portions of the adhesive from emerging on the surface of the sheet.
[22] In the present invention, a reverse texture corresponding to air vent channels is embossed in a release liner using a general embossing method. The release liner is made by coating paper with a thermoplastic resin such as polyethylene or polypropylene, so that it can be easily deformed by heat or pressure.
[23] An embossing roll is heated to about a melting point of the resin coated on the release liner and imparts patterns to the release liner that passes through a nip portion between the embossing roll and a rubber roll. At this time, the temperature of the embossing roll is preferably 90 to 16O0C. If the temperature of the embossing roll is
too low, desired patterns cannot be embossed due to lack of fluidity of the thermoplastic resin. On the contrary, if the temperature of the embossing roll is too high, the resin is excessively melted, so that desired patterns cannot be embossed.
[24] The channels on the adhesive surface formed by embossing the release liner have different heights and widths and are connected with one another, so that air trapped upon application of the sheet can be discharged outside the sheet.
[25] As for the heights of the channels, the air vent channels include low channels (L)
11 having a height of 10mm or less and high channels (H) 12 having a height of 10 to 30mm, as shown in Fig. 1. These channels are connected to one another, as shown in Figs. 2 and 3. If the height of an air vent channel is 10mm or less, the channel is generally easily vanished, resulting in poor discharge of air. However, if the length of the channel is reduced to 4mm or less, air discharge effects are obtained before the channel is vanished, and the channel is then easily vanished to increase a contact area with a target surface, which is expected to improve an adhesive force and to prevent a pattern from emerging on the surface of the sheet. At this time, in order to discharge air through the low channels (L) 11 outside the sheet, the low channels (L) 11 should be connected to the high channels (H) 12. Since the channels (H) 12 have a height larger than that of the low channels (L) 11, the high channels are not easily vanished and thus can discharge air collected through the low channels (L) 11 outside the sheet. Hereinafter, the low channels (L) 11 that are first vanished are called first-stage channels, and the high channels (H) 12 are called second-stage channels.
[26] However, it is preferred that even the first-stage channels have a height of at least
3mm. This is because a variation in the thickness of the adhesive coated on the release liner is generally 1 to 2mm and thus there is a need for securing the height of the channels larger than the variation, as well as the height of the channels less than 3mm causes the channels to be vanished immediately upon contact thereof with a target surface so that air vent effects cannot be expected even for a short period of time.
[27] If the lengths of the first-stage channels are excessively shortened to have a pattern pitch of 2mm or less, a contact area with a target surface is reduced to decrease an initial adhesive force, which may cause separation immediately when the sheet is attached to a curved portion. Thus, it is preferred that patterns configured by the first- stage and second-stage channels have a pitch of at least 2mm.
[28] To achieve effective discharge of air, the width of the channels should be considered in addition to the height of the channels. If the width of a channel is large, the channel may not be vanished even after the sheet has been attached to a target surface, thereby serving as an inflow passage of a fluid, and a contact area with the target surface is reduced to decrease an adhesive force. On the contrary, if the width of a channel is small, the channel may be clogged before air trapped upon application of
the sheet is discharged. Thus, each of the first-stage channels (L) preferably has a width of 10 to 30mm and each of the second-stage channels (H) preferably has a width of 30 to 60mm.
[29] The first-stage channels (L) are expected to obtain air discharge effects for a short period of time but have a degraded function of discharging air outside edges of the sheet. Thus, the first-stage channels are preferably formed to be connected to the second-stage channels (H) such that they have lengths of less than 4mm. That is, the second-stage channels preferably have a pattern pitch of less than 4mm.
[30] Each of the channels may have a cross section with a geometric figure such as a rectangle, a triangle, a pentagon and a U-shape, and the first-stage channels may have sectional shapes different from those of the second-stage channels. Even though the sectional shape of a channel is not a rectangle, its behavior is determined according to a bottom width and a largest height of the channel except a case where the sectional shape is exceptional. Thus, hereinafter, the term width refers to a bottom width of a channel, and the term height refers to a largest height of a channel.
[31] Such patterns are formed on the surface of an adhesive by means of transfer.
Specifically, a liquid adhesive is coated and dried on the surface of a release liner having embossed patterns. The adhesive preferably has a thickness of 20 to 50mm after it has been dried. Thereafter, a base sheet is attached thereto by means of rolling or casting, thereby producing a finished product.
[32]
Advantageous Effects
[33] According to the present invention, first-stage channels having a smaller height and second-stage channels having a larger height are formed to be connected to one another, so that the first-stage channels can serve as air vent channels with a shorter length for a short period of time and then be vanished to give a wider contact area, while the second-stage channels can serve as air vent channels for a long period of time, resulting in improvement of application of an adhesive sheet, and prevention of emergence of patterns on a front surface of the sheet from the channels to improve an appearance.
[34]
Brief Description of the Drawings
[35] The above and other objects, features and advantages of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
[36] Fig. 1 is a sectional view showing air vent channels of an adhesive layer according to the present invention;
[37] Fig. 2 shows an adhesive surface of the adhesive layer having the air vent channels according to the present invention; and [38] Fig. 3 shows an adhesive surface of an adhesive layer having air vent channels according to another embodiment of the present invention. [39]
Mode for the Invention
[40] The present invention will be described in greater detail in connection with the following examples.
[41] [42] Appearance Evaluation Test of Film After Application Thereof [43] A 20 20cm test sample was prepared and then attached to a transparent acrylic plate by means of squeeze. One day after the attachment, the film was evaluated based on its surface state and removal of trapped air classified as follows.
[44] [45] Table 1
[46] Evaluation of Adhesive Force [47] The evaluation of an adhesive force was conducted using a tensile adhesive force test method. A test sample was prepared and attached to a target subject according to KS Al 107 test method, and the adhesive force was evaluated 20 minutes and 24 hours after the attachment.
[48] [49] Measurement of Height and Width of Channel [50] A release liner was fixed to a flat glass plate, and SURFTEST 301 surface roughness tester available from Mitutoyo Co. was used. The height and width of an embossment line were determined from a graph obtained while a probe of the tester moves over the release liner, and then used as the height and width of a channel, re-
spectively.
[51]
[52] Example
[53] Embossment line patterns for forming channels with specification shown in Table
2 below were formed on a release surface of a release liner. An acrylic adhesive was coated and dried on the release liner, and a base sheet was put together with the release liner to form an adhesive sheet with a thickness of 30 to 35mm. The release liner was peeled off and the sheet was attached to an acrylic plate. After one day passed, the surface of the sheet was smooth. When 20 minutes passed after the attachment, the adhesive force was lower than that in Comparative Example 1. However, when 24 hours passed after the attachment, the adhesive force was similar to that in Comparative Example 1.
[54]
[55] Comparative Example 1
[56] An adhesive sheet was prepared in the substantially same manner as the example, except that a release liner in which an air removal channel is not formed on a release surface thereof. As seen from Table 2 below, an adhesive force was highest but an appearance after the attachment was worst due to trapped air.
[57]
[58] Comparative Example 2
[59] Only one kind of channels having the same height and width was formed on a release surface of a release liner, and an adhesive sheet was formed using the release liner in the same manner as the example. The detailed specification of the channels is shown in Table 2. In Comparative Example 2, it was possible to more easily prevent air from being trapped as compared with Comparative Example 1, but convexo- concave patterns of the adhesive emerged on an outer surface of the sheet. An adhesive force was lower than that in Comparative Example 1 by about 20% regardless of time passed after the attachment.
[60]
[61] Comparative Example 3
[62] Even in this comparative example, one kind of channels was formed according to the specification shown in Table 2, and an adhesive sheet was formed in the same manner as the example. There was no reduction in an adhesive force, but air was trapped upon attachment of the sheet to an acrylic plate.
[63]
[64] Comparative Example 3-1
[65] In this comparative example, an adhesive sheet was formed in the same manner as
Comparative Example 3, except that a pattern pitch was increased as shown in Table 2.
An adhesive force was good, but air removal was extremely deteriorated.
[66]
[67] Comparative Example 4 [68] In this comparative example, one kind of channels was formed as shown in Table 2. The width of the channels was increased, and an adhesive sheet was formed in the same manner as the example. An adhesive force was remarkably deteriorated, and a film surface state was poor.
[69] [70] Comparative Example 4-1 [71] In this comparative example, an adhesive sheet was formed in the same manner as Comparative Example 4 except that the height of the channels was increased as shown in Table 2. An adhesive force was remarkably deteriorated, and a film surface state was extremely poor.
[72] [73] Comparative Example 5 [74] In this comparative example, low channels (L) and high channels (H) were formed as shown in Table 2. The channels had a relatively larger width over the example. Deterioration of an adhesive force was found due to decrease in an initial adhesion area, and a surface film state was found to be slightly poor.
[75] [76] Comparative Example 6 [77] Even in this comparative example, low channels (L) and high channels (H) were formed as shown in Table 2. The channels had a relatively larger height over the example. There was a little deterioration of an adhesive force, but a film surface state was found to be very poor.
[78] [79] Table 2
[80] It was found from these comparative examples shown in Table 2 and other subsidiary experiments that air cannot be effectively discharged but an adhesive force was maintained when the height of channels is not greater than 10mm. In addition, in order to prevent patterns caused by convexo-concave portions on an adhesive surface from being recognized with the naked eye on a front surface of a sheet after the sheet is attached, the height of the channels is preferably not greater than 20mm.
[81] In the example, two kinds of channels were formed on the basis of the above observation results. When a pattern pitch is 2 to 4mm, there is disadvantage in that an adhesive force is low for a short period of time, but there is an advantage in that the adhesive force is recovered after 24 hours to a level similar to that in Comparative Example 1, and it was also found that the appearance of the sheet was improved.
[82]
Industrial Applicability
[83] According to the present invention, first-stage channels having a smaller height and second-stage channels having a larger height are formed to be connected to one another, so that the first-stage channels can serve as air vent channels with a shorter length for a short period of time and then be vanished to give a wider contact area, while the second-stage channels can serve as air vent channels for a long period of time, resulting in improvement of application of an adhesive sheet, and prevention of emergence of patterns on a front surface of the sheet from the channels to improve an appearance.
[84]
[85]
Claims
[1] An adhesive sheet having multi-staged air vent channels, the adhesive sheet including a base film and a pressure sensitive adhesive layer, wherein the adhesive layer has surface patterns formed by transfer of convexo- concave portions on a release surface of a release liner, the surface patterns being constructed of at least two kinds of channels connected with each other, the at least two kinds of channels including first-stage channels with a relatively smaller height and second-stage channels with a relatively larger height, and the first-stage channels are arranged at a smaller interval and the second-stage channels are arranged at a larger interval, so that the first-stage channels provides air vent channels before they are vanished after the adhesive sheet is attached to a target surface so that an adhesion area to the target surface can increase as the first-stage channels are vanished, and the second-stage channels provide air vent channels even after the first-stage channels are vanished.
[2] The adhesive sheet as claimed in claim 1, wherein the first-stage channels have a height of 3mm to 10mm and a width of 10mm to 30mm, and the second-stage channels have a height of 10mm to 20mm and a width of 30mm to 60mm.
[3] The adhesive sheet as claimed in claim 1 or 2, wherein the second-stage channels are arranged at an interval of 2mm to 4mm and the lengths of air vent paths of the first-stage channels are limited to the dimensional range.
[4] An adhesive sheet having multi-staged air vent channels, the adhesive sheet including a base film, an adhesive layer and a release liner, wherein the adhesive layer has embossed surface patterns on a release surface of the release liner, the embossed surface patterns being constructed of at least two kinds of embossment lines connected with each other, the at least two kinds of embossment lines including first-stage embossment lines with a relatively smaller embossment height and second-stage channels with a relatively larger embossment height, and the first-stage embossment lines are arranged at a smaller interval and the second-stage embossment lines are arranged at a larger interval, so that, when the release liner is peeled off from the adhesive sheet and the sheet is attached to a target surface, first-stage channels corresponding to the first-stage embossment lines provide air vent channels before the first-stage channels are vanished due to a rheological property of the adhesive so that an adhesion area to the target surface can increase as the first-stage channels are vanished, and second-stage channels corresponding to the second-stage embossment lines
provide air vent channels after the first-stage channels are vanished.
[5] The adhesive sheet as claimed in claim 4, wherein the first-stage embossment lines have a height of 3mm to 10mm and a width of 10mm to 30mm, and the second-stage embossment lines have a height of 10mm to 20mm and a width of 30mm to 60mm.
[6] The adhesive sheet as claimed in claim 4 or 5, wherein the second-stage embossment lines are arranged at an interval of 2mm to 4mm and the lengths of air vent paths of the first-stage channels are limited to the dimensional range.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007500699A JP2007520623A (en) | 2005-01-28 | 2006-01-11 | Adhesive sheet with multi-stage air discharge passage |
EP06700132.1A EP1841830B1 (en) | 2005-01-28 | 2006-01-11 | Adhesive sheet having multi-staged air vent channels |
ES06700132.1T ES2552544T3 (en) | 2005-01-28 | 2006-01-11 | Adhesive sheet with multi-phase aeration channels |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2005-0007921 | 2005-01-28 | ||
KR20050007921 | 2005-01-28 | ||
KR1020050109139A KR100709746B1 (en) | 2005-01-28 | 2005-11-15 | Adhesive Sheet having Multi-Staged Air Vent Channels |
KR10-2005-0109139 | 2005-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006080781A1 true WO2006080781A1 (en) | 2006-08-03 |
Family
ID=36740741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2006/000106 WO2006080781A1 (en) | 2005-01-28 | 2006-01-11 | Adhesive sheet having multi-staged air vent channels |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060172104A1 (en) |
EP (1) | EP1841830B1 (en) |
JP (1) | JP2007520623A (en) |
WO (1) | WO2006080781A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005061766A1 (en) * | 2005-12-23 | 2007-06-28 | Lohmann Gmbh & Co Kg | Strippable cover or release liner for adhesive coatings on adhesive tape or film, has raised relief structures on the surface which are pressed into the adhesive to form an open channel structure with a depth of a few microns |
WO2014197368A1 (en) * | 2013-06-06 | 2014-12-11 | 3M Innovative Properties Company | Method for preparing structured laminating adhesive articles |
WO2014197194A1 (en) * | 2013-06-06 | 2014-12-11 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
US10308004B2 (en) | 2013-06-06 | 2019-06-04 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5112780B2 (en) * | 2007-08-03 | 2013-01-09 | リンテック株式会社 | Easy-adhesive adhesive sheet and method for producing the same |
JP2009062454A (en) * | 2007-09-06 | 2009-03-26 | Lintec Corp | Easily attachable self-adhesive sheet and method for manufacturing it |
KR20100103870A (en) * | 2008-01-11 | 2010-09-28 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Stretch releasing optically clear pressure sensitive adhesive |
JP2009221380A (en) * | 2008-03-17 | 2009-10-01 | Lintec Corp | Adhesive sheet and separate sheet-attached adhesive sheet using the same |
JP2010180271A (en) * | 2009-02-03 | 2010-08-19 | Lintec Corp | Easily pastable self-adhesive sheet and method for producing the same |
EP2781569B1 (en) * | 2011-11-14 | 2018-06-20 | LG Chem, Ltd. | Adhesive film |
EP2604664B1 (en) * | 2011-12-15 | 2014-11-26 | 3M Innovative Properties Company | Polyvinyl chloride adhesive film |
US9119450B2 (en) * | 2012-12-21 | 2015-09-01 | Novartis Ag | Contact lens package |
WO2015170678A1 (en) * | 2014-05-09 | 2015-11-12 | シャープ株式会社 | Adhesive member, method for producing adhesive member, and method for producing bonded member |
JP6570329B2 (en) * | 2015-06-12 | 2019-09-04 | スリーエム イノベイティブ プロパティズ カンパニー | Article having an adhesive layer and a release layer |
KR101725237B1 (en) | 2015-12-31 | 2017-04-26 | 강태욱 | Attaching sheet enhanced function of depriving air bubble |
WO2019202749A1 (en) * | 2018-04-16 | 2019-10-24 | 株式会社寺岡製作所 | Pressure-sensitive adhesive tape |
TWI674196B (en) * | 2018-09-12 | 2019-10-11 | 陽程科技股份有限公司 | Adhesive film and device with adhesive film |
JP7327934B2 (en) * | 2018-12-21 | 2023-08-16 | スリーエム イノベイティブ プロパティズ カンパニー | Adhesive sheet and method of applying adhesive sheet to rough surface |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998029231A1 (en) * | 1996-12-31 | 1998-07-09 | Minnesota Mining And Manufacturing Company | Multiple embossed webs |
WO1999065999A1 (en) * | 1998-06-18 | 1999-12-23 | Minnesota Mining And Manufacturing Company | Cling films having a microreplicated topography and methods of making and using same |
WO2000069985A1 (en) * | 1999-05-13 | 2000-11-23 | 3M Innovative Properties Company | Adhesive-backed articles |
WO2003025078A1 (en) * | 2001-09-14 | 2003-03-27 | Lintec Corporation | Easily stuck adhesive sheet and its manufacture method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995011945A1 (en) * | 1993-10-29 | 1995-05-04 | Minnesota Mining And Manufacturing Company | Pressure-sensitive adhesives having microstructured surfaces |
US6197397B1 (en) * | 1996-12-31 | 2001-03-06 | 3M Innovative Properties Company | Adhesives having a microreplicated topography and methods of making and using same |
US6630218B1 (en) * | 1998-12-21 | 2003-10-07 | 3M Innovative Properties Company | Adhesive sheet and method for producing the same |
JP2002332463A (en) * | 2001-05-08 | 2002-11-22 | Hiroto Hojo | Sheet with air-releasing adhesive and method for producing the same |
JP4334883B2 (en) * | 2003-02-20 | 2009-09-30 | 大日本印刷株式会社 | Adhesive sheet |
WO2005100498A1 (en) * | 2004-04-16 | 2005-10-27 | Riken Technos Corporation | Pressure-sensitive adhesive sheet and releasing material |
-
2006
- 2006-01-11 EP EP06700132.1A patent/EP1841830B1/en not_active Expired - Fee Related
- 2006-01-11 JP JP2007500699A patent/JP2007520623A/en active Pending
- 2006-01-11 WO PCT/KR2006/000106 patent/WO2006080781A1/en active Application Filing
- 2006-01-25 US US11/338,945 patent/US20060172104A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998029231A1 (en) * | 1996-12-31 | 1998-07-09 | Minnesota Mining And Manufacturing Company | Multiple embossed webs |
WO1999065999A1 (en) * | 1998-06-18 | 1999-12-23 | Minnesota Mining And Manufacturing Company | Cling films having a microreplicated topography and methods of making and using same |
WO2000069985A1 (en) * | 1999-05-13 | 2000-11-23 | 3M Innovative Properties Company | Adhesive-backed articles |
WO2003025078A1 (en) * | 2001-09-14 | 2003-03-27 | Lintec Corporation | Easily stuck adhesive sheet and its manufacture method |
Non-Patent Citations (1)
Title |
---|
See also references of EP1841830A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005061766A1 (en) * | 2005-12-23 | 2007-06-28 | Lohmann Gmbh & Co Kg | Strippable cover or release liner for adhesive coatings on adhesive tape or film, has raised relief structures on the surface which are pressed into the adhesive to form an open channel structure with a depth of a few microns |
WO2014197368A1 (en) * | 2013-06-06 | 2014-12-11 | 3M Innovative Properties Company | Method for preparing structured laminating adhesive articles |
WO2014197194A1 (en) * | 2013-06-06 | 2014-12-11 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
US10106707B2 (en) | 2013-06-06 | 2018-10-23 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
US10308004B2 (en) | 2013-06-06 | 2019-06-04 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
US10316226B2 (en) | 2013-06-06 | 2019-06-11 | 3M Innovative Properties Company | Method for preparing structured laminating adhesive articles |
US10723919B2 (en) | 2013-06-06 | 2020-07-28 | 3M Innovative Properties Company | Method for preparing structured adhesive articles |
Also Published As
Publication number | Publication date |
---|---|
EP1841830B1 (en) | 2015-06-17 |
US20060172104A1 (en) | 2006-08-03 |
JP2007520623A (en) | 2007-07-26 |
EP1841830A1 (en) | 2007-10-10 |
EP1841830A4 (en) | 2010-09-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006080781A1 (en) | Adhesive sheet having multi-staged air vent channels | |
CN100572478C (en) | Adhesive sheet with multi-staged air vent channels | |
KR101108596B1 (en) | A pressure sensitive adhesive sheet with air-eliminable channels | |
JP5236854B2 (en) | Structured release liner and coating method thereof | |
KR100867158B1 (en) | Release liners with pyramidal structures and adhesive backed articles comprising thereof | |
AU2009231221B2 (en) | Method of forming a three-dimensional microstructure on a surface, uses thereof, and microstructured products so obtained | |
JP4370426B2 (en) | Composite embossed web | |
CN102046748B (en) | Method of making adhesive article | |
JP2001507732A (en) | Adhesive having micro-replicated morphology and method of manufacturing and using the same | |
JP2006070273A5 (en) | ||
JP2002518543A (en) | Cling film with microreplicated topographic structure and method of making and using same | |
EP1648977A1 (en) | Adhesives and release liners with pyramidal structures | |
EP0725617B1 (en) | Structured adhesive closure systems | |
KR101320300B1 (en) | Pressure-sensitive adhesive sheet with air-eliminable channels | |
US20240059938A1 (en) | Release liner for repositionable adhesive articles | |
US6749791B1 (en) | Structured surface production and use of same | |
WO1998000469A1 (en) | Articles including microcellular foam materials and topographically modified adhesive layers as components thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2006700132 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007500699 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200680000039.7 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 3740/CHENP/2007 Country of ref document: IN |
|
WWP | Wipo information: published in national office |
Ref document number: 2006700132 Country of ref document: EP |